1. I. G. Chistyakov and B. K. Vainshtein, Kristallografiya,8, 570 (1963).
2. B. K. Vainshtein and L. I. Tatarinova, Kristallografiya, 4, 782 (1959).
3. A. I. Kitaigorodskii, Organic Chemical Crystallography, Izd-vo AN SSSR, Moscow, (1955).
4. B. K. Vainshtein, Diffraction of X-Rays on Chain Molecules [in Russian], Izd-vo AN SSSR, Moscow, (1963).
5. G. Oster and D. P. Riley, Acta crystallogr.,5, 272 (1952).